JPH0357502Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention aims to improve the etching mechanism of a printing machine, more specifically, to roughen the surface of the etching font roller of an automatic printing machine, and to improve the etching font roller of an automatic printing machine. This invention relates to an etching mechanism for a printing machine that allows automatic or manual prehumidification.

(Prior art) When printing with an automatic printing machine, generally,
Plate feeding → Etching → Inking → Transfer → Printing → Discharging →
Printing is performed automatically through a series of steps called Bc (blanket cylinder) cleaning.

In this case, even if the printing plate has been etched in advance, if you feed the plate in a dry state and proceed directly to the inking process, there is a possibility that the ink will be accepted even to the areas where there is no printed image, so please do not It is necessary to moisten the entire surface of the printing plate.

In the printing machine, when printing is resumed after a long pause, the Molton roller used to moisten the printing plate becomes dry, and the above-mentioned series of automatic printing processes alone cannot supply the etchant. There is a problem that the printing is delayed and the plate becomes smeared.

For this reason, many printing machines are capable of performing a prehumidification operation separately from the etching operation. During the pre-humidification operation, it is necessary to properly moisten the Molton roller in advance while the Molton roller is separated from the master cylinder.

(Problems to be Solved by the Invention) FIGS. 6 and 7 are diagrams for explaining the problems of the conventional etching mechanism.

In FIG. 6, 4 is a font roller, 5 is a squeezing roller, and 6 is a Molton roller.

Conventionally, in an etching mechanism using a rubber roller as the squeezing roller 5, as shown in FIG. 6, the etchant accumulates at both ends of the squeezing roller 5 and Molton roller 6, and dries at the center. There was a problem that the supply distribution of the amount of etching liquid in the longitudinal direction of the Molton roller 6 was not uniform.

Further, it took a considerable amount of time to pump up the etchant with the font roller 4, squeeze it with the squeezing roller 5, and wet the entire molten roller 6.
Since the prehumidification switch had to be pressed continuously for a long time in order to achieve an appropriate prehumidification state, the operability was poor.

FIG. 7 is a diagram showing a case where a sponge is used for the squeezing roller 5.

In this case, if the center of the Molton roller 6 becomes moderately wet, the etchant will spill out at both ends of the roller, and the supply distribution of the amount of etchant to the Molton roller 6 will also be poor, resulting in one rotation. There was a problem in that the amount of etchant supplied was too large, making it difficult to properly adjust the prehumidity, resulting in overhumidity.

Further, when the squeezing roller is made of a sponge, there are problems in that the sponge gets clogged with ink and is difficult to clean, and the amount of etchant supplied changes.

On the other hand, there was a problem in that the font roller and the bearing were stuck together due to the etchant, causing slips between the squeezing roller and the font roller.

An object of the present invention is to provide an etching mechanism for a printing machine that can perform proper etching operations and stable wetting operations.

(Means for Solving the Problems) In order to achieve the above object, the etching mechanism of the printing machine according to the present invention is basically partially immersed in the etchant in the etching font, and has a rough surface. A font roller molded into a font roller, a squeeze roller made of a rubber material that is in contact with the font roller, a Molton roller that is in contact with the squeeze roller and selectively contacts the master cylinder, and an etching command signal. an etching drive system that brings the Molton roller into contact with the master cylinder and transmits rotation from the drive source to each roller; and a prehumidification command signal that causes the Molton roller to rotate from the drive source while being separated from the master cylinder. and a prehumidification drive system that transmits the moisture to each of the rollers.

(Example) The present invention will be described in more detail below with reference to the drawings and the like.

1 to 4 are schematic diagrams of a mechanism showing an embodiment of the present invention, in which FIG. 1 is a cross-sectional view showing the roller arrangement etc. when the etching unit is viewed from the operation side, and FIG. , an assembled view of the entire etching unit, and FIGS. 3 and 4 are a side view and a front view showing the control and drive system for the operation of the etching unit.

In Fig. 1, 1 is the master cylinder (Mc);
2 is an etching font, 3 is an etching liquid, 4 is a font roller, 5 is a squeezing roller, 6 is a Morton roller, and 7 is an etching cam.

The etching font 2 contains an etchant 3, and the font roller 4 is partially immersed in the etchant 3.

The font roller 4 according to the present invention has a rough roller surface. Sandblow Fountain roller 4 with stainless steel beads (about φ1mm) for 3 minutes or more.
Appropriate moisture can be added by roughening the surface for about 5 minutes. This sandblasting is done using a sandblasting method similar to that used for deburring castings, and it takes about 3 to 5 minutes to sandblast approximately 50 rollers, making it more cost-effective than the traditional chrome plating method. It's also cheap.

The font roller 4 is in contact with the squeeze roller 5, and the squeeze roller 5 is in contact with the Molton roller 6.
is in contact with. As the squeezing roller 5, an ordinary rubber roller is used.

Next, the mechanism of the present invention will be explained along with the operation of each part.

While the printing machine is rotating, the rotation of the Mc gear 16 shown in FIGS. 3 and 4 is transmitted to the gears 17 and 18.

When the etching solenoid 23 (see FIG. 3) is energized by an etching command from the control section, the etching lever 25 moves in the directions of arrows T and R, and this state is maintained.

In this state, a roller 13 provided coaxially with the Molton roller 6 at the maximum diameter part of the cam 7 (see Fig. 1)
(see FIG. 2a), and a slight gap is created between the engaging portions of the lever 10 and the lock lever 12. For this reason, the lever 11 is
is moved in the direction of arrow L (see FIG. 2b), and the coaxially provided lever 12 is also moved in the direction of arrow W (see FIG. 2c).

When the lock lever 12 and the lever 10 are disengaged, the force of the spring 33 on the operation side and the non-operation side acts (see Figures 2b and c), and the Molton roller 6 (see Figure 1) moves in the direction indicated by the arrow. move in the direction of Therefore, the Molton roller 6 comes into contact with Mc1, and the prehumidifying lever 28 is moved in the direction of arrow D via the connecting lever 34 due to the operation of the etching lever 25 (see FIG. 3) described above.

As a result, the clutch pawl wheel 30 (see FIG. 4) is released, the clutch spring 31 is tightened, and the rotation of the gear 18 is transmitted to the gears 19, 20, 21, and 22.

Further, the molten roller 6 and the squeezing roller 5 and the squeezing roller 5 and the font roller 4 transmit rotation by contact friction force, so that the etchant 3 in the font 2 is pumped up and
The etching state is normal.

Here, by placing the bearing 14 (see FIG. 4) deeper than the roller end face, the amount of water pumped on both end faces is reduced, and the distribution of the supply amount of the etchant 13 is made uniform. Further, the bearing 14 and the collar 15 are made of Teflon to reduce the adhesion of the etchant 13.

In the case of automatic printing, when the above-mentioned operation is performed a selected number of times (for example, 0 to 9 times) by a digital switch (not shown), the etching solenoid 23 mentioned above is turned off, and the original etching is performed in the reverse operation to that described above. Return to state.

If the printing machine has been left unused for a long time and the Molton roller has completely dried out, press the prehumidification switch on the operation panel (not shown) during manual rotation to turn on the prehumidification solenoid 24 (see Figure 3). The prehumidifying lever 28 moves in the direction of arrow D, and the rollers 4, 5, and 6 rotate an appropriate number of times (for example, 70 cylinder revolutions) in the same manner as in the automatic mode, and the prehumidifying lever 28 moves in the direction of arrow D. It is controlled so that Note that during this pre-humidifying operation, the movement of the pre-humidifying lever 28 (see FIG. 3) is not transmitted to the etching lever 25 through the long hole of the connecting lever 34, so the Molton roller 6 moves in the direction of arrow B. It is in a state where it is separated from Mc1.

Also, when prehumidifying for a short time, use the prehumidifying lever 2.
By pressing 8 in the direction of the arrow H, the same operation as described above can be performed manually as appropriate.

FIG. 5 is a diagram showing the wet distribution of etching liquid on the Molton roller using the etching mechanism according to the present invention and the conventional etching mechanism.

In FIG. 5, A is the case where the roller surface of the font roller 4 is made rough according to the present invention, B,
C is an example in which a conventional font roller is used, and B is an example in which the squeezing roller is made of rubber.
1 and 2 respectively show cases in which the squeezing roller is made of sponge.

When using a conventional font roller, the amount of etch liquid is distributed more at both ends than at the center, and the absolute amount tends to be larger when a sponge is used as the squeezing roller than when rubber is used. It was hot (see Figure 5 B and C).

When the surface of the font roller is roughened as in the present invention, the distribution is uniform and the amount can be maintained at an appropriate level (see FIG. 5A).

(Effects of the Invention) The effects of the etching mechanism according to the invention described in detail above will be explained in comparison with conventional etching mechanisms.

Conventionally, there was a drawback that the pre-humidifying time was too long, but in the present invention, the surface of the font roller 4 is made rough, so that it is possible to supply an appropriate amount of moisture, and it is now possible to pre-humidify quickly. .

Conventionally, the supply distribution of the etch liquid was poor, but in the present invention, the surface of the font roller 4 is made rough, so that the liquid pumped from both sides of the font roller 4 can be controlled by the squeezing roller 6. As a result, the amount of liquid no longer increases excessively only at both ends of the roller, and the total amount of water lifted approaches the amount of water lifted at both ends (see Figure 5A).

In addition, by placing the bearing of the font roller deeper than the roller end face, the amount of water lifted at the end face was reduced, so the distribution of the supplied etchant became uniform.

Previously, it was necessary to hold down the prehumidification switch for a long time (more than 5 minutes) during the prehumidification time, but
In the present invention, since the surface of the font roller is made rough, the pre-humidification time is shortened.

In the past, the bearing and shaft of the font roller were stuck due to the etchant, causing the font roller to not rotate, but in this invention, the bearing and collar of the font roller are made of Teflon, which increases the adhesion of the etchant. Since the problem has been reduced, the bearing and shaft no longer stick together.

Furthermore, since the surface of the font roller is made rough, the friction with the squeezing roller 5 is increased, and rotational slip between the rollers 5 and 4 is eliminated.

Conventionally, the squeezing roller was made of sponge material,
The amount of moisture supplied per rotation was large, making it difficult to adjust the humidity properly and easily resulting in overhumidity.However, in this invention, the squeezing roller is an ordinary rubber roller, and the surface of the font roller is made rough. As a result, it is now possible to provide adequate moisture.

In addition, since the prehumidification system uses both an electric switch and a manual lever, it has become possible to finely adjust the prehumidification.

Conventionally, the squeezing roller was made of sponge material, which caused ink clogging and was difficult to clean.
The amount of moisture supplied was unstable, but in the present invention, the squeezing roller is a regular roller, so it is easy to clean.

[Brief explanation of the drawing]

1 to 4 are schematic diagrams of a mechanism showing an embodiment of the present invention, in which FIG. 1 is a cross-sectional view showing the roller arrangement etc. when the etching unit is viewed from the operation side, and FIG. , an assembled view of the entire etching unit, and FIGS. 3 and 4 are a side view and a front view showing the control and drive system for the operation of the etching unit. FIG. 5 is a diagram showing the wet distribution of etching liquid on the Molton roller using the etching mechanism according to the present invention and the conventional etching mechanism. Figure 6,
FIG. 7 is a diagram for explaining the problems of the conventional etching mechanism. 1... Master cylinder, 2... Etching font, 3... Etching liquid, 4... Font roller, 5... Squeezing roller, 6... Morton roller,
7...Etching cam, 8...Unit right side plate,
9... Lever right, 10... Lever left, 11... Lever, 12... Lock lever, 13... Roll, 1
4... Bearing, 15... Collar, 16... Mc gear,
17, 18, 19, 20, 21, 22...gear,
23... Etching solenoid, 24... Prehumidification solenoid, 25... Etching lever, 26,2
7... Spring, 28... Prehumidification lever 29... Shaft, 3
0...Clutch pawl wheel, 31...Spring clutch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) From a font roller partially immersed in an etching solution in an etching font and formed with a rough surface, and a rubber material in contact with the font roller. a squeezing roller, a Molton roller that is in contact with the squeezing roller and selectively contacts the master cylinder, and an etching command signal that causes the Molton roller to contact the master cylinder and rotation from a drive source to each of the rollers. Etched drive system to transmit,
An etching mechanism for a printing machine comprising a prehumidification drive system that transmits rotation from a drive source to each of the rollers while the Molton roller remains separated from the master cylinder in response to a prehumidification command signal. (2) The etching mechanism for a printing machine according to claim 1, wherein the font roller has a rough surface formed by sandblasting with stainless steel beads having a diameter of about 1 mm. (3) The prehumidification drive system is driven by a prehumidification command signal and is controlled to automatically stop driving after rotating a preset number of times. Etching mechanism of the printing machine described. (4) The etching mechanism for a printing machine according to claim 1, wherein the prehumidification drive system can be driven by a manual lever.